SAIP 2011 Support
Brightest Cluster Galaxies - Ages and metallicities of stellar populations
Presented by Ms. Viljoen DANIèL on 14 Jul 2011 from 12:30 to 12:45
Type: Oral Presentation
Track: Track D1 - Astrophysics
<p>The aim of this project is to study the stellar populations, and thereby evolution and star formation histories of brightest cluster galaxies (BCGs). In particular, I will determine if a Single Stellar Populations (SSP) or Composite Stellar Populations (CSP) provides the most significant fit for the BCGs using high signal-to-noise ratio (S/N), long-slit spectra, obtained on the Gemini and WHT telescopes. By using the ULySS software package, the data will be fitted against the Pegase. HR and Vazdekis/Miles stellar population models to simultaneously derive the SSP equivalent ages and metallicities of the BCGs. Furthermore the stellar populations will be decomposed into two or more components, and the chi square (χ2) value for each component is used to determine whether a SSP or CSP represents the BCGs most accurately. We find that both young and old stars are present in the stellar populations of these BCGs, and those BCGs, therefore show surprisingly diverse star formation histories.
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